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Causality between greenhouse world and genesis of a resource for rare-earth elements deciphered by high-precision geochemical analyses and mathematical methods

Research Project

Project/Area Number 20H02678
Research Category

Grant-in-Aid for Scientific Research (B)

Allocation TypeSingle-year Grants
Section一般
Review Section Basic Section 31020:Earth resource engineering, Energy sciences-related
Research InstitutionThe University of Tokyo

Principal Investigator

Yasukawa Kazutaka  東京大学, 大学院工学系研究科(工学部), 准教授 (00757742)

Co-Investigator(Kenkyū-buntansha) 大田 隼一郎  東京大学, 大学院工学系研究科(工学部), 講師 (70793579)
宮崎 隆  国立研究開発法人海洋研究開発機構, 海域地震火山部門(火山・地球内部研究センター), 主任研究員 (80371722)
Project Period (FY) 2020-04-01 – 2023-03-31
Project Status Completed (Fiscal Year 2022)
Budget Amount *help
¥17,550,000 (Direct Cost: ¥13,500,000、Indirect Cost: ¥4,050,000)
Fiscal Year 2022: ¥4,680,000 (Direct Cost: ¥3,600,000、Indirect Cost: ¥1,080,000)
Fiscal Year 2021: ¥8,190,000 (Direct Cost: ¥6,300,000、Indirect Cost: ¥1,890,000)
Fiscal Year 2020: ¥4,680,000 (Direct Cost: ¥3,600,000、Indirect Cost: ¥1,080,000)
Keywordsレアアース泥 / 海底鉱物資源 / オスミウム同位体 / バリウム同位体 / 深海堆積物 / 地球化学分析 / 多変量解析 / マスバランスモデル / 地球システム / 同位体分析 / 物質循環
Outline of Research at the Start

本研究の目的は,新生代初期の温室地球における高品位レアアース泥の成因を解明することである.そのために,温室地球で生じた海底堆積物の広域地球化学データセットの構築,多変量統計解析と同位体分析による環境・物質循環変動の痕跡の抽出,および上記項目の成果を制約条件とした海洋元素マスバランス計算によるレアアース泥生成過程の定量的検討を行う.

Outline of Final Research Achievements

The goal of this study was to elucidate the cause of the formation of high-grade rare-earth element (REE)-rich mud in the early Cenozoic greenhouse world. We used deep-sea sediment core samples taken from the North and South Pacific and Indian Oceans for chemical composition, carbon and oxygen isotopic analyses, and osmium and barium isotopic analyses. The results showed that chemical weathering of continental rocks and marine bioproductivity were enhanced during the significantly warming period (called “hyperthermal” events). Furthermore, numerical simulations suggest that changes in marine bioproductivity, as well as those in continental weathering intensity and sea level, may have played an important role in the production of very high-grade REE-rich mud.

Academic Significance and Societal Importance of the Research Achievements

本研究の学術的意義は,将来の気候変動の予測精度向上という観点から近年盛んに研究が進んでいる過去の温室地球が,地球システム内の元素循環の変動を通じて,深海底におけるレアアースの有望な資源の生成と密接に関係していたことを新規データや数値計算によって初めて示した点にある.本研究により,特に海洋の生物生産性の変遷が,有望なレアアース泥の分布を推定する上で考慮すべき重要事項となった.現代社会の様々なハイテク機器に欠かせないレアアースの新規資源探査における新たな指針を提示したという点で,本研究の社会的意義は非常に大きい.

Report

(4 results)
  • 2022 Annual Research Report   Final Research Report ( PDF )
  • 2021 Annual Research Report
  • 2020 Annual Research Report
  • Research Products

    (27 results)

All 2023 2022 2021 2020

All Journal Article (8 results) (of which Int'l Joint Research: 1 results,  Peer Reviewed: 8 results,  Open Access: 8 results) Presentation (19 results) (of which Int'l Joint Research: 4 results)

  • [Journal Article] Rare‐Earth Elements in Deep‐Sea Sediments in the South Pacific Gyre: Source Materials and Resource Potentials2023

    • Author(s)
      Tanaka Erika、Mimura Kazuhide、Nakamura Kentaro、Ohta Junichiro、Yasukawa Kazutaka、Kato Yasuhiro
    • Journal Title

      Geochemistry, Geophysics, Geosystems

      Volume: 24 Issue: 3

    • DOI

      10.1029/2022gc010681

    • Related Report
      2022 Annual Research Report
    • Peer Reviewed / Open Access
  • [Journal Article] Essential processes involving REE-enrichment in biogenic apatite in deep-sea sediment decoded via multivariate statistical analyses2022

    • Author(s)
      Kazutaka Yasukawa, Junichiro Ohta, Morihisa Hamada, Qing Chang, Hitomi Nakamura, Kana Ashida, Yutaro Takaya, Kentaro Nakamura, Hikaru Iwamori, Yasuhiro Kato
    • Journal Title

      Chemical Geology

      Volume: 614 Pages: 121184-121184

    • DOI

      10.1016/j.chemgeo.2022.121184

    • Related Report
      2022 Annual Research Report
    • Peer Reviewed / Open Access
  • [Journal Article] Enhanced continental chemical weathering during the multiple early Eocene hyperthermals: New constraints from the southern Indian Ocean2022

    • Author(s)
      Tanaka Erika、Yasukawa Kazutaka、Ohta Junichiro、Kato Yasuhiro
    • Journal Title

      Geochimica et Cosmochimica Acta

      Volume: 331 Pages: 192-211

    • DOI

      10.1016/j.gca.2022.05.022

    • Related Report
      2022 Annual Research Report
    • Peer Reviewed / Open Access
  • [Journal Article] Secular Variations in Provenance of Sedimentary Components in the Western North Pacific Ocean Constrained by Sr Isotopic Features of Deep‐Sea Sediments2022

    • Author(s)
      Tanaka Erika、Yasukawa Kazutaka、Nakamura Kentaro、Ohta Junichiro、Miyazaki Takashi、Vaglarov Bogdan Stefanov、Machida Shiki、Fujinaga Koichiro、Iwamori Hikaru、Kato Yasuhiro
    • Journal Title

      Geochemistry, Geophysics, Geosystems

      Volume: 23 Issue: 1

    • DOI

      10.1029/2021gc009729

    • Related Report
      2021 Annual Research Report
    • Peer Reviewed / Open Access / Int'l Joint Research
  • [Journal Article] Geological features and resource potential of deep-sea mud highly enriched in rare-earth elements in the Central Pacific Basin and the Penrhyn Basin2021

    • Author(s)
      Ohta Junichiro、Yasukawa Kazutaka、Nakamura Kentaro、Fujinaga Koichiro、Iijima Koichi、Kato Yasuhiro
    • Journal Title

      Ore Geology Reviews

      Volume: 139 Pages: 103387-103387

    • DOI

      10.1016/j.oregeorev.2021.104440

    • Related Report
      2021 Annual Research Report
    • Peer Reviewed / Open Access
  • [Journal Article] Stratigraphic Variations of Fe-Mn Micronodules and Implications for the Formation of Extremely REY-Rich Mud in the Western North Pacific Ocean2021

    • Author(s)
      Yasukawa Kazutaka、Kino Satoshi、Ohta Junichiro、Azami Keishiro、Tanaka Erika、Mimura Kazuhide、Fujinaga Koichiro、Nakamura Kentaro、Kato Yasuhiro
    • Journal Title

      Minerals

      Volume: 11 Issue: 3 Pages: 270-270

    • DOI

      10.3390/min11030270

    • Related Report
      2020 Annual Research Report
    • Peer Reviewed / Open Access
  • [Journal Article] Geochemical features of Fe-Mn micronodules in deep-sea sediments of the western North Pacific Ocean: Potential for co-product metal extraction from REY-rich mud2020

    • Author(s)
      Yasukawa Kazutaka、Kino Satoshi、Azami Keishiro、Tanaka Erika、Mimura Kazuhide、Ohta Junichiro、Fujinaga Koichiro、Nakamura Kentaro、Kato Yasuhiro
    • Journal Title

      Ore Geology Reviews

      Volume: 127 Pages: 103805-103805

    • DOI

      10.1016/j.oregeorev.2020.103805

    • Related Report
      2020 Annual Research Report
    • Peer Reviewed / Open Access
  • [Journal Article] Geochemical Features of Redox-Sensitive Trace Metals in Sediments under Oxygen-Depleted Marine Environments2020

    • Author(s)
      Yano Moei、Yasukawa Kazutaka、Nakamura Kentaro、Ikehara Minoru、Kato Yasuhiro
    • Journal Title

      Minerals

      Volume: 10 Issue: 11 Pages: 1021-1021

    • DOI

      10.3390/min10111021

    • Related Report
      2020 Annual Research Report
    • Peer Reviewed / Open Access
  • [Presentation] 南太平洋Campbell Plateauの海底堆積物から復元した古第三紀前期温室地球における超温暖化イベントの化学的特徴2023

    • Author(s)
      Kazutaka Yasukawa, Erika Tanaka, Ann G. Dunlea, Ingrid Hendy, Bryan Niederbockstruck, Ursula Rohl, Minoru Ikehara, Kentaro Nakamura, Yasuhiro Kato
    • Organizer
      日本地球惑星科学連合2023年大会
    • Related Report
      2022 Annual Research Report
  • [Presentation] 海洋-堆積物間のNd質量収支計算に基づくレアアース泥生成の支配因子の長期変動の検討2023

    • Author(s)
      松波亮佑・安川和孝・中村謙太郎・加藤泰浩
    • Organizer
      日本地球惑星科学連合2023年大会
    • Related Report
      2022 Annual Research Report
  • [Presentation] Long-term variation of barium stable isotope ratio as a proxy for paleo-productivity during the Paleogene “Hothouse” world2023

    • Author(s)
      Yusuke Kuwahara, Kakeru Ikegami, Kazutaka Yasukawa, Takashi Miyazaki, Erika Tanaka, Kentaro Nakamura, Yasuhiro Kato
    • Organizer
      Goldschmidt 2023
    • Related Report
      2022 Annual Research Report
    • Int'l Joint Research
  • [Presentation] The Paleogene seawater Os isotope record of the Indian Ocean: Implications for the chemical weathering feedback against Eocene Hyperthermal Events.2022

    • Author(s)
      Kuwahara, Y., Yasukawa, K., Ohta, J., Yano, M., Mimura, K., Tanaka, E., Fujinaga, K., Nakamura, K., Ikehara, M., Kato, Y.
    • Organizer
      12th International Conference on Climatic and Biotic Events of the Paleogene (CBEP12)
    • Related Report
      2022 Annual Research Report
    • Int'l Joint Research
  • [Presentation] Geochemistry and morphology of Fe-Mn micronodules in REY-rich mud: Implications for the formation process of highly promising deep-sea REY resource.2022

    • Author(s)
      Yasukawa, K., Kino, S., Ohta, J., Azami, K., Tanaka, E., Mimura, K., Fujinaga, K., Nakamura, K., Kato, Y.
    • Organizer
      3rd Edition of World Congress on Geology & Earth Science
    • Related Report
      2022 Annual Research Report
    • Int'l Joint Research
  • [Presentation] 多変量統計解析を用いた深海堆積物中の生物源アパタイトにおけるレアアース濃集過程の検討2022

    • Author(s)
      安川和孝・大田隼一郎・浜田盛久・常青・中村仁美・芦田果奈・高谷雄太郎・中村謙太郎・岩森光・加藤泰浩
    • Organizer
      日本地球化学会第69回年会
    • Related Report
      2022 Annual Research Report
  • [Presentation] 中央北太平洋の古海水Os同位体記録に基づく古第三紀温暖化イベントの化学風化と火成活動に関する考察2022

    • Author(s)
      池上 翔・安川 和孝・田中 えりか・大田 隼一郎・桑原 佑典・矢野 萌生・藤永 公一郎・中村 謙太郎・加藤 泰浩
    • Organizer
      日本地球惑星科学連合2022年大会
    • Related Report
      2022 Annual Research Report
  • [Presentation] インド洋の炭酸塩堆積物より復元した古第三紀の海水Os同位体比記録:始新世「超温暖化」イベントにおける化学風化フィードバックへの示唆2022

    • Author(s)
      桑原佑典・安川和孝・大田隼一郎・矢野萌生・見邨和英・田中えりか・藤永公一郎・中村謙太郎・加藤泰浩
    • Organizer
      日本地球惑星科学連合2022年大会
    • Related Report
      2022 Annual Research Report
  • [Presentation] 海洋のNd質量収支計算を用いた超高濃度レアアース泥の生成条件の制約2021

    • Author(s)
      安川和孝・平松彩人・河原畑智朱・見邨和英・田中えりか・大田隼一郎・藤永公一郎・中村謙太郎・加藤泰浩
    • Organizer
      第37回希土類討論会
    • Related Report
      2021 Annual Research Report
  • [Presentation] 南鳥島レアアース泥に含まれるマイクロマンガンノジュールの地球化学的特徴:超高濃度レアアース泥の生成機構に対する示唆2021

    • Author(s)
      安川和孝・木野聡志・大田隼一郎・浅見慶志朗・田中えりか・見邨和英・藤永公一郎・中村謙太郎・加藤泰浩
    • Organizer
      2021年度日本地球化学会年会
    • Related Report
      2021 Annual Research Report
  • [Presentation] 南鳥島レアアース泥に含まれるマイクロマンガンノジュールの地球化学的特徴とレアメタル資源ポテンシャル2021

    • Author(s)
      安川和孝・木野聡志・浅見慶志朗・田中えりか・見邨和英・ 大田隼一郎・藤永公一郎・中村謙太郎・加藤泰浩
    • Organizer
      日本地質学会第128年学術大会
    • Related Report
      2021 Annual Research Report
  • [Presentation] Stratigraphic variations in geochemistry and morphology of Fe-Mn micronodules: Implications for the formation process of extremely REY-rich mud in the western North Pacific Ocean2021

    • Author(s)
      Kazutaka Yasukawa, Satoshi Kino, Junichiro Ohta, Keishiro Azami, Erika Tanaka, Kazuhide Mimura, Koichiro Fujinaga, Kentaro Nakamura, Yasuhiro Kato
    • Organizer
      Goldschmidt 2021 conference (virtual)
    • Related Report
      2020 Annual Research Report
    • Int'l Joint Research
  • [Presentation] Preliminary report of IODP Expedition 378: South Pacific Paleogene Climate2021

    • Author(s)
      安川和孝,田中えりか,Deborah Thomas, Ursula Rohl, Laurel Childress, IODP Expedition 378 Science Party
    • Organizer
      日本地球惑星科学連合2021年大会
    • Related Report
      2020 Annual Research Report
  • [Presentation] Os同位体分析に基づく古第三紀超温暖化イベントにおける化学風化フィードバックの考察2021

    • Author(s)
      池上翔,安川和孝,田中えりか,大田隼一郎,桑原佑典,矢野萌生,藤永公一郎,加藤泰浩
    • Organizer
      日本地球惑星科学連合2021年大会
    • Related Report
      2020 Annual Research Report
  • [Presentation] Os同位体比層序に基づく南鳥島周辺深海堆積物の複数のレアアース濃度ピークの生成年代2021

    • Author(s)
      小田裕太,大田隼一郎,田中えりか,安川和孝,桑原佑典,矢野萌生,藤永公一郎,中村謙太郎,加藤泰浩
    • Organizer
      日本地球惑星科学連合2021年大会
    • Related Report
      2020 Annual Research Report
  • [Presentation] 主要・微量元素組成データの独立成分分析に基づくレアアース泥の起源成分の空間分布2021

    • Author(s)
      平子雅啓,安川和孝,田中えりか,藤永公一郎,中村謙太郎,加藤泰浩
    • Organizer
      日本地球惑星科学連合2021年大会
    • Related Report
      2020 Annual Research Report
  • [Presentation] 海洋のNd質量収支計算を用いた超高濃度レアアース泥の生成条件の制約2021

    • Author(s)
      安川和孝,平松彩人,河原畑智朱,見邨和英,田中えりか,大田隼一郎,藤永公一郎,中村謙太郎,加藤泰浩
    • Organizer
      第37回希土類討論会
    • Related Report
      2020 Annual Research Report
  • [Presentation] 独立成分分析に基づくレアアース泥の主要・微量元素組成の統計的特徴2021

    • Author(s)
      平子雅啓,安川和孝,田中えりか,藤永公一郎,中村謙太郎,加藤泰浩
    • Organizer
      第37回希土類討論会
    • Related Report
      2020 Annual Research Report
  • [Presentation] オスミウム同位体比層序に基づく南鳥島周辺深海堆積物の第2レアアース濃度ピークの堆積年代2021

    • Author(s)
      小田裕太,大田隼一郎,田中えりか,安川和孝,桑原佑典,矢野萌生,藤永公一郎,中村謙太郎,加藤泰浩
    • Organizer
      第37回希土類討論会
    • Related Report
      2020 Annual Research Report

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Published: 2020-04-28   Modified: 2024-01-30  

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